The Model 7937 from Special Timer Corporation provides 2-10 outputs for dust collector systems. Each output provides 120VAC or 240VAC and 1–3 amps in a sequential manner programmed by the operator. Timing ranges are available from 16 milliseconds – 2 hours standard and longer times are available by special request. On & off times are programmed via a dial type potentiometer for ease of use and as shown below in the timing chart there are many options for both on & off time ranges. To specify your on time and off time ranges simply add two dash numbers to our root part number as follows 7937-{on time range}-{off time range}. For Example: 7937-1-6 implies 16-600millisecond “on time” and 1-60 seconds “off time”.

The sequence of the 7937 is as follows:

• # 1 output on for programmed “on time”, then
• # 1 output off for programmed “off time”, then
• # 2 output on for programmed “on time”, then
• # 2 output off for programmed “off time”
• And so on until last programmed output….
• Then back to # 1 “on time” and the sequence begins again.

The Model 7937 Dust Collector Timer can also be controlled for “as needed” operations. It can be controlled manually with an on/off switch or can be controlled automatically with a Differential Pressure switch. Set the high pressure point that depicts the need to clean filters to turn the timer on and set a low pressure point that depicts clean filters to turn the timer off.

The model 7937 can be mounted in standard size Nema rated enclosures and they are often shipped with on/off switches, pilot lights, solenoid valves and conduit openings to accept your wiring.